/*
* Each thread executes this process until completed
*/
void mythread(int thread_id)
{
int n, i, j;
if(thread_id < 4){
n = 10;
} else {
n = 15;
}
if(thread_id % 2 == 0){ //Consumer
for (i = 0; i < n; i++){
mysem_wait(full);
mysem_wait(mutex);
buffer_count--;
buffer[buffer_count] = ' ';
printf("Thread %d consumed item #%d. Buffer count = %d\n", thread_id, i, buffer_count);
mysem_signal(mutex);
mysem_signal(empty);
for (j = 0; j < MAX/2; j++);
}
} else { //Producer
for (i = 0; i < n; i++){
mysem_wait(empty);
mysem_wait(mutex);
buffer[buffer_count] = 'X';
buffer_count++;
printf("Thread %d produced item #%d. Buffer count = %d\n", thread_id, i, buffer_count);
mysem_signal(mutex);
mysem_signal(full);
for (j = 0; j < MAX/2; j++);
}
}
}
// Provided thread code
void consumer(int thread_id)
{
// The declaration of j as an integer was added on 10/24/2011
int i, j, n;
n = (thread_id < 4)? 10: 15;
for (i = 0; i < n; i++)
{
// Wait on full
mysem_wait(full);
// Wait on mutex
mysem_wait(mutex);
// modify the buffer
removeX();
// Release mutex, up empty
mysem_signal(mutex);
mysem_signal(empty);
for (j = 0; j < MAX; j++);
}
}
// Provided thread code
void producer(int thread_id)
{
// The declaration of j as an integer was added on 10/24/2011
// The threads with ID#(0 - 3) perform insertion/deletion operations for 10 times
// while other threads perform the operations for 15 times
int i, j, n;
n = (thread_id < 4)? 10: 15;
for (i = 0; i < n; i++)
{
// Wait on empty
mysem_wait(empty);
// Wait on mutex
mysem_wait(mutex);
// modify the buffer
addX();
// Release stuff, up full
mysem_signal(mutex);
mysem_signal(full);
for (j = 0; j < MAX; j++);
}
}
